Lifting jack



March 19, 1929. H. E. NEWKIRK 1,706,361

. LIFTING JACK Filed Sept. 22, 1927 Invemar Attorngy Patented Mar. 19, 1929.

warren STATES HARRYE; 1\TEWKIRK,- F WILMINGTON, NORTH CAROLINA.

-' LIFTING'J'ACK.

Application filed September 22, 1927. Serial No. 221,317.

The present invention relates to improve ments in lifting jacks, and has reference more particularly to a jack for use in cooperation with vehicle axles.

One of the-important objectsof the pres ent invention is to provide a lifting ack which will at all times be positive and eflicient in its operation, the same including a pivotally mounted spur gear having an axle engaging jaw associated therewith, and cooperating with the spur gear is a manually actuated screw or worm.

A still further object of the invention is to provide a lifting jack of the above mentioned character, which is simple in construction, inexpensive, strong and durable and further well adapted to the purposes for which it is designed.

Other objects and advantages will become apparent during the course of the following description taken in connection with the accompanying drawing.

In the accompanying drawing forming part of this application, and in which like numerals indicate like parts throughout the same:

Figure 1 is a side elevation, with parts broken away of my improved lifting jack showing the axle engaging jaw in its lowermost position.

Figure 2 is an edge elevation, thescrew or worm carrying shaft being shown in section.

In the drawing wherein for the purpose of illustration is shown the preferred embodiment of my invention, the numeral 1 designates generally my improved lifting jack, the same comprising a base 2 on which is arranged the frame 3, which frame is substantially of triangular shape in side elevation as clearly illustrated in Figure 1. One side of the frame is of greater length than the other side as clearly illustrated in Figure 1. The frame is formed at its apex portion with a pair of spaced upwardly, extending standards 4 and 5, respectively, and the upper en (1' of each standard is enlarged to provide the journals 6 and 7 respectively through which extends the pin 8.

A segmental spur gear 9 is associated with the pin 8 and is adapted for swinging movement between the spaced standards 1 and 5, in a manner to be presently described. An axle engaging jaw 10 is formed on one end of this segmental spur gear 9 as clearly illustrated in Figure 1. For the purpose of preventing lateral swaying of thepivoted spur gear 9 durmg 1ts swinging movement between the spaced standards 4 and 5, there is formed on each face of the spur gear adjacent the toothed edge 11 a. curved shoulder 12 and simllar shoulders 13 are formed on the inner opposed faces of the frame below the standards 111 the manner as clearly illustrated in Figure 2. The coacting shoulders are slightly spaced from one another so as not to interfere with the swinging movement of the jaw carrying segment.

Journaled for rotation in the frame below the segmental spur gear 9 is the horizontally extending shaft 14, the same carrying at its intermediate portion the screw or worm 15, it being understood of course that the frame is cut out to accommodate this worm and the teeth of this screw or Worm cooperate with the toothed edge 11 of the spur gear 9 in the manner as clearly shown in Figure 1 for the purpose of effecting a swingingmovement of the spur gear and the lifting jaw formed on one end portion thereof. A thrust bearing 16 of any conventional construction is associated with the screw carrying shaft 14; and the lower portion of the frame in the manner as shown in Figure 1.

The inner end of the shaft 1 1 extends beyond the inner side of the frame 3 and due to the construction of the frame, the screw will be off center as is readily obvious from the construction disclosed in Figure 1. An extensible handle 17 is adapted to be operatively connected to the inner end of the shaft 14 by a universal connection ilhistratedgeneral 1y at 18 and the free end of this handle is formed with a suitable actuating crank portion 19.

' With the parts arranged as shown in Fig ure 1 of the drawing, the lifting jaw 10 is in its lowermost position so that the jack can be placed beneath the front or. rear axle of an automobile and when the ack is properly positioned beneath the axle, it will be readily obvious that when the shaft 14 is rotated by operation of the handle17, the screw 15 will cooperate with the toothed edge of the seg mental spur gear to swing said spur gear on its pivot 8, and simultaneously raising the jaw carrying end of the gear to effect the upward movement of the axle engaged by the jaw ,10 so that the vehicle may be raised to the desired height for any particular purpose. Manifestly by rotating the shaft 14 in the reverse direction, the spur gear 9 Will swing in the opposite direction to lower the aw carrying end of the segmental spur gear and simultaneously lower the axle engaged by said aw.

A hand hold 20 is formed in the segmental gear 9 at a point opposite the jaw 10 tofacilitate the carryingof the jack from place to lace.

It will thus be seen from the foregoing description, that I have provided a simple and efficient lifting jackwvhich will save considerable time and labor in raising an automobile axle, and furthermore due to its simplicity, the jack can be constructed at a very low cost. r

While I have shown the preferred embodiment of my invention, it is to he understood that various changes in the-size, shape and arrangement of parts may he resorted to Without departing from the spirit of the in-' A lifting jack of the class described com prising a supporting frame, a segmental gear pivotally mounted in the frame, an axle engaging jaw formed on one end of said segmental gear, a manually actuated screw arranged in the frame for cooperation With the pivoted to swing said gear onits pivot, and cooperating shoulders formed on the adjacent sides of the gear and the frame to prevent lateral swaying of the gear during its swinging movement. 7 V

In testimony whereof I affix my signature.

HARRY E. NEWKIR'K. 

